Dictionary  long•wallPronunciation: (lông'wôl", long'-), [key] —adj. Mining. noting or pertaining to a means of extracting coal or other minerals in an underground mine from a continuous face, the roof before the face being supported at intervals by temporary or movable artificial supports. Cf. room-and-pillar. —n. the continuous face so worked. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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